The 2017–18 snooker season was a series of professional snooker tournaments played between 4 May 2017 and 7 May 2018. The season began with the pro–am Vienna Snooker Open in May 2017 and ended with the 2018 World Snooker Championship in April the following year. Ronnie O'Sullivan earned a joint-record five ranking titles in the season. He joined Stephen Hendry (1990/1991), Ding Junhui (2013/2014), and Mark Selby (2016/2017) in winning five ranking titles in the same season.